October 5, 2021

Septic Tanks


A septic tank comes in different shapes and sizes, for example the old Cornish block-built tanks are built out of stone, concrete and even Cornish slate, with the more up to date septic tanks made from plastic or fibre glass, often referred to as onions or bottles. Generally septic tanks have a primary chamber which allows for a collection of sludge to settle, it then fills up to a certain level and overflows into a soakaway, the filtered water then gets dispersed into the ground.

The soakaway is a vital part of your septic tank, without regular empties the sludge will build up and overflow into your soakaway. This will block up the soakaway and reduce the efficiency making it soak away very slowly or not at all. We recommend tanks are emptied every 12 – 18 months depending on the size and occupants using the tank.

A sewage treatment plant also comes in different shapes and sizes. They are often split into three chambers. The primary tank is where the waste water and sewage enter and the solids are stored, the second chamber is where the waste water gets treated by an aeration pump. Finally, the approximately 95% clean water is released from the third chamber as it is ready to be dispersed into a watercourse as agreed by the relevant environment agency.

It is often mistaken that septic tank and sewage treatments plants are the same thing, however there are several differences. A septic tank produces a polluted waste where a sewage treatment plant generates a clean effluent which can be discharged directly to another watercourse. Septic tanks are fairly low maintenance and only require emptying once a year whereby a sewage treatment plant needs regular servicing and emptying, they also often require electricity to operate.

We have the facilities to remove up to 6000 gallons at any one time.

From January 2023 Pellows will be taking deposits to secure a booking.